[参考译文] AM625：电源管理功能在 SDK11.1 中不起作用

#1。 我意识到除了使用 LP 板进行 sdk11.1 测试外、我还使用 sdk11.0 进行了测试。

root@am62xx-lp-evm:~# uname -a
Linux am62xx-lp-evm 6.12.17-ti-00771-gc85877d40f8e #1 SMP PREEMPT Tue Mar 25 12:45:29 UTC 2025 aarch64 GNU/Linux
root@am62xx-lp-evm:~# rtcwake -s 5 -m mem
rtcwake: assuming RTC uses UTC ...
rtcwake: wakeup from "mem" using /dev/rtc0 at Thu Jan  1 00:01:17 1970
[   65.468281] PM: suspend entry (deep)
[   65.472004] Filesystems sync: 0.000 seconds
[   86.505855] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[   86.511973] rcu:     3-...0: (0 ticks this GP) idle=d06c/1/0x4000000000000000 softirq=3893/3893 fqs=2319
[   86.521181] rcu:     (detected by 1, t=5255 jiffies, g=4689, q=2825 ncpus=4)
[   86.527959] Sending NMI from CPU 1 to CPUs 3:
[   87.733893] tps6598x 0-003f: tps6598x_interrupt: failed to read version (-110)
[   89.781892] tps6598x 0-003f: tps6598x_interrupt: failed to read event1
[   91.317900] tps6598x 0-003f: tps6598x_interrupt: failed to read version (-110)
[   93.365887] tps6598x 0-003f: tps6598x_interrupt: failed to read event1
[   94.901900] tps6598x 0-003f: tps6598x_interrupt: failed to read version (-110)
[   96.528885] rcu: rcu_preempt kthread starved for 2497 jiffies! g4689 f0x0 RCU_GP_DOING_FQS(6) ->state=0x0 ->cpu=0
[   96.539142] rcu:     Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
[   96.548259] rcu: RCU grace-period kthread stack dump:
[   96.553299] task:rcu_preempt     state:I stack:0     pid:16    tgid:16    ppid:2      flags:0x00000008
[   96.562601] Call trace:
[   96.565039]  __switch_to+0xe4/0x140
[   96.568540]  __schedule+0x268/0xa84
[   96.572027]  schedule+0x34/0x104
[   96.575251]  schedule_timeout+0x84/0xfc
[   96.579081]  rcu_gp_fqs_loop+0x118/0x4c8
[   96.583000]  rcu_gp_kthread+0x134/0x160
[   96.586830]  kthread+0x110/0x114
[   96.590054]  ret_from_fork+0x10/0x20
[   96.593626] rcu: Stack dump where RCU GP kthread last ran:
[   96.599099] Sending NMI from CPU 1 to CPUs 0:
[   96.603457] NMI backtrace for cpu 0 skipped: idling at default_idle_call+0x28/0x3c

#2. 现在 我使用相同的 LP 板使用 SDK11.1 进行测试、lpm 命令有效。

root@am62xx-lp-evm:~# uname -a
Linux am62xx-lp-evm 6.12.35-ti-00915-ge3e551586dfa #1 SMP PREEMPT Tue Jul  1 21:17:52 UTC 2025 aarch64 GNU/Linux
root@am62xx-lp-evm:~#
root@am62xx-lp-evm:~#
root@am62xx-lp-evm:~# rtcwake -s 5 -m mem
rtcwake: assuming RTC uses UTC ...
rtcwake: wakeup from "mem" using /dev/rtc0 at Thu Jan  1 00:00:57 1970
[   45.063230] PM: suspend entry (deep)
[   45.066952] Filesystems sync: 0.000 seconds
[   45.101359] Freezing user space processes
[   45.107848] Freezing user space processes completed (elapsed 0.002 seconds)
[   45.114866] OOM killer disabled.
[   45.118104] Freezing remaining freezable tasks
[   45.123941] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
[   45.131366] printk: Suspending console(s) (use no_console_suspend to debug)
[   45.171158] remoteproc remoteproc0: stopped remote processor 5000000.m4fss
[   45.174807] Disabling non-boot CPUs ...
[   45.177798] psci: CPU3 killed (polled 0 ms)
[   45.181605] psci: CPU2 killed (polled 0 ms)
[   45.185390] psci: CPU1 killed (polled 0 ms)
[   45.187235] Enabling non-boot CPUs ...
[   45.187684] Detected VIPT I-cache on CPU1
[   45.187745] GICv3: CPU1: found redistributor 1 region 0:0x00000000018a0000
[   45.187810] CPU1: Booted secondary processor 0x0000000001 [0x410fd034]
[   45.189212] CPU1 is up
[   45.189504] Detected VIPT I-cache on CPU2
[   45.189543] GICv3: CPU2: found redistributor 2 region 0:0x00000000018c0000
[   45.189599] CPU2: Booted secondary processor 0x0000000002 [0x410fd034]
[   45.190800] CPU2 is up
[   45.191099] Detected VIPT I-cache on CPU3
[   45.191139] GICv3: CPU3: found redistributor 3 region 0:0x00000000018e0000
[   45.191194] CPU3: Booted secondary processor 0x0000000003 [0x410fd034]
[   45.192711] CPU3 is up
[   45.193477] ti-sci 44043000.system-controller: ti_sci: wakeup source:0x50, pin:0xff, mode:0x0
[   45.217730] am65-cpsw-nuss 8000000.ethernet: set new flow-id-base 19
[   45.227777] am65-cpsw-nuss 8000000.ethernet eth0: PHY [8000f00.mdio:00] driver [TI DP83867] (irq=POLL)
[   45.227807] am65-cpsw-nuss 8000000.ethernet eth0: configuring for phy/rgmii-rxid link mode
[   45.353101] OOM killer enabled.
[   45.356249] Restarting tasks ... done.
[   45.362764] random: crng reseeded on system resumption
[   45.368078] k3-m4-rproc 5000000.m4fss: Core is off in resume
[   45.374227] remoteproc remoteproc0: powering up 5000000.m4fss
[   45.381628] remoteproc remoteproc0: Booting fw image am62-mcu-m4f0_0-fw, size 55100
[   45.393297] rproc-virtio rproc-virtio.4.auto: assigned reserved memory node m4f-dma-memory@9cb00000
[   45.404822] virtio_rpmsg_bus virtio0: rpmsg host is online
[   45.410571] virtio_rpmsg_bus virtio0: creating channel ti.ipc4.ping-pong addr 0xd
[   45.412035] rproc-virtio rproc-virtio.4.auto: registered virtio0 (type 7)
[   45.418409] virtio_rpmsg_bus virtio0: creating channel rpmsg_chrdev addr 0xe
[   45.425007] remoteproc remoteproc0: remote processor 5000000.m4fss is now up
[   45.439521] PM: suspend exit
root@am62xx-lp-evm:~#

#3. 借助 P1 板、SDK11.0 和 SDK11.1 均可正常使用。

root@am62xx-lp-evm:~# uname -a
Linux am62xx-lp-evm 6.12.35-ti-00915-ge3e551586dfa #1 SMP PREEMPT Tue Jul  1 21:17:52 UTC 2025 aarch64 GNU/Linux
root@am62xx-lp-evm:~#
root@am62xx-lp-evm:~# rtcwake -s 5 -m mem
rtcwake: assuming RTC uses UTC ...
rtcwake: wakeup from "mem" using /dev/rtc0 at Thu Jan  1 00:02:33 1970
[  130.520552] PM: suspend entry (deep)
[  130.524364] Filesystems sync: 0.000 seconds
[  130.544308] Freezing user space processes
[  130.550654] Freezing user space processes completed (elapsed 0.002 seconds)
[  130.557687] OOM killer disabled.
[  130.560920] Freezing remaining freezable tasks
[  130.566846] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
[  130.574261] printk: Suspending console(s) (use no_console_suspend to debug)
[  130.616277] remoteproc remoteproc0: stopped remote processor 5000000.m4fss
[  130.619836] Disabling non-boot CPUs ...
[  130.622767] psci: CPU3 killed (polled 0 ms)
[  130.627171] psci: CPU2 killed (polled 0 ms)
[  130.631080] psci: CPU1 killed (polled 0 ms)
[  130.633319] Enabling non-boot CPUs ...
[  130.633748] Detected VIPT I-cache on CPU1
[  130.633803] GICv3: CPU1: found redistributor 1 region 0:0x00000000018a0000
[  130.633867] CPU1: Booted secondary processor 0x0000000001 [0x410fd034]
[  130.635304] CPU1 is up
[  130.635594] Detected VIPT I-cache on CPU2
[  130.635633] GICv3: CPU2: found redistributor 2 region 0:0x00000000018c0000
[  130.635685] CPU2: Booted secondary processor 0x0000000002 [0x410fd034]
[  130.637039] CPU2 is up
[  130.637359] Detected VIPT I-cache on CPU3
[  130.637403] GICv3: CPU3: found redistributor 3 region 0:0x00000000018e0000
[  130.637460] CPU3: Booted secondary processor 0x0000000003 [0x410fd034]
[  130.638917] CPU3 is up
[  130.639657] ti-sci 44043000.system-controller: ti_sci: wakeup source:0x50, pin:0xff, mode:0x0
[  130.662323] am65-cpsw-nuss 8000000.ethernet: set new flow-id-base 19
[  130.672331] am65-cpsw-nuss 8000000.ethernet eth0: PHY [8000f00.mdio:00] driver [TI DP83867] (irq=POLL)
[  130.672361] am65-cpsw-nuss 8000000.ethernet eth0: configuring for phy/rgmii-rxid link mode
[  130.797742] OOM killer enabled.
[  130.800890] Restarting tasks ... done.
[  130.806931] random: crng reseeded on system resumption
[  130.812305] k3-m4-rproc 5000000.m4fss: Core is off in resume
[  130.818368] remoteproc remoteproc0: powering up 5000000.m4fss
[  130.824288] remoteproc remoteproc0: Booting fw image am62-mcu-m4f0_0-fw, size 55100
[  130.838744] rproc-virtio rproc-virtio.3.auto: assigned reserved memory node m4f-dma-memory@9cb00000
[  130.849782

无论如何、我们都将与 SDK11.1 配合使用。